More:Halo 2: Missions: Battle Creek

From GameWinners

Contents 1 Hidden weapon 2 Hidden message

Hidden weapon

 Xbox  Go to the Blue base. Run to the end of the base where the ramp is located. Tilt your gun to the bottom in the "northeast" direction. You should see the "Hold X to pick up weapon" message. Hold X to pick it up. This is a hidden weapon which is useful when cornered without any ammunition.
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Hidden message

At the location where you pick up the sniper, there is a hidden message under one of the rocks.